Electrochemical Energy Storage Materials & Devices Based on Nanostructure Arrays

Jinping Liu

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology

Abstract: In this talk, I will mainly discuss the electrochemical energy storage application of one kind of emerging electrode architecture, that is, nanostructure arrays grown directly on current collector substrates. The direct growth of nanostructures on current collector represents a popular way to fabricate thin-film/flexible electrodes, which not only ensures good charge transport, but also provides sufficient structural interspaces for buffering volume expansion of the electrode materials. When combined with using flexible current collector, such thin-film electrode also has greater durability to shape deformation, giving better mechanical flexibility. By pairing appropriate electrode materials, ordered core-shell and hierarchical hybrid nanostructures can be rationally designed, which leads to synergistic improvement in terms of electrical/ionic conductivity, electrochemical stability and structural integration. Hybrid electrode materials with high capacitance/capacity, long cycle life and exceptional rate capability can thus be obtained; the related performance enhancement mechanism will also be discussed in detail. I will particularly show that these binder-free nanoarray electrodes have enabled high-performance thin-film/flexible/solid-state supercapacitors and batteries as well as supercapacitor-battery hybrid systems, and can be utilized to explore new electrochemical energy storage mechanisms & materials.

Biography: Jinping Liu received his PhD degree from Central China Normal University (CCNU), China in June 2009. During the period of 2008-2011, he did visiting and post-doctoral research in Nan-yang Technological University (NTU), Singapore. He is currently Full Professor at Wuhan Uni-versity of Technology. The Liu group's research interests include the nanostructures synthesis and their electrochemical applications (batteries, supercapacitors, electrocatalysis and so on). He is the author of ~100 articles with more than 8800 SCI citations. He developed over 10 kinds of nanoarray electrodes for electrochemical energy storage and proposed "dual ion synergistic en-ergy storage" and "aqueous quasi-conversion reaction" mechanisms.